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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investments |  |
Amortized Cost | $ 619,507 | $ 545,771
Fair Value | 619,897 | 545,968
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 91,445 | 83,478
Fair Value | 91,445 | 83,478
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost |  | 147,983
Fair Value |  | 148,108
Municipal securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost |  | 1,562
Fair Value |  | 1,561
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 66,435 | 40,620
Fair Value | 66,453 | 40,590
U.S. government agency securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 10,205 | 5,267
Fair Value | 10,204 | 5,266
Certificates of deposit | Less than 1 year |  |
Investments |  |
Amortized Cost | 19,959 | 28,049
Fair Value | 19,959 | 28,049
U.S. treasuries | Less than 1 year |  |
Investments |  |
Amortized Cost | 421,093 | 211,055
Fair Value | 421,469 | 211,158
U.S. treasuries | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 10,370 | 6,077
Fair Value | $ 10,367 | 6,078
Variable rate demand notes | Due 1 - 10 years |  |
Investments |  |
Amortized Cost |  | 3,905
Fair Value |  | 3,905
Variable rate demand notes | Due 11 - 20 years |  |
Investments |  |
Amortized Cost |  | 8,886
Fair Value |  | 8,886
Variable rate demand notes | Due 21 - 30 years |  |
Investments |  |
Amortized Cost |  | 6,885
Fair Value |  | 6,885
Variable rate demand notes | Due 31 - 40 years |  |
Investments |  |
Amortized Cost |  | 2,004
Fair Value |  | $ 2,004

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- Definition This item represents the cost of debt and equity securities net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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